Dev Tools

Developer tools that live in the browser save the context-switching of opening a terminal or installing a package for a one-off task. Format a JSON response, decode a Base64 string, inspect a JWT, generate a hash, or encode a URL — all without leaving the page you're working on.

Every tool processes data client-side. Sensitive tokens, passwords, and API keys are never sent to a server.

Which developer tool should I use?

I want to…	Use this tool
Pretty-print or validate JSON	JSON Formatter
Encode or decode Base64	Base64 Encoder/Decoder
Encode or decode URL characters	URL Encoder/Decoder
Escape or unescape HTML entities	HTML Entity Encoder
Escape strings for JSON, regex, or SQL	String Escape Tool
Convert a Unix timestamp to a date	Timestamp Converter
Test or debug a regex pattern	Regex Tester
Decode a JWT and inspect its claims	JWT Decoder
Generate MD5, SHA-256, or SHA-512 hashes	Hash Generator
Hash a password with bcrypt	Bcrypt Hash Generator
Build or look up a cron expression	Cron Generator
Format or beautify SQL queries	SQL Formatter
Format and validate XML	XML Formatter
Convert YAML to JSON or back	YAML ↔ JSON Converter
Convert CSV to JSON or back	CSV ↔ JSON Converter
Convert a curl command to code	cURL Converter
Minify or beautify HTML, CSS, or JS	Code Minifier
Pick a color and generate a palette	Color Picker
Check color contrast for WCAG accessibility	Color Contrast Checker
Generate a CSS gradient	CSS Gradient Generator
Generate a CSS box-shadow	CSS Box Shadow Generator
Generate Apache redirect rules	.htaccess Generator
Generate meta tags and Open Graph tags	Meta Tag Generator
Build a robots.txt file	Robots.txt Generator